JPH09295338A - Heat insulating hollow form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a perfect shape without the generation of a recessed deformation by an atmospheric pressure by providing a plate-like form with oxygen barrier properties and also a reinforcing means for integrating an inner wall and an outer wall into a single piece, and further, exhausting air from a hollow part to set the hollow part in a vacuum state. SOLUTION: A bottom container 2, a lid container and a connectively installed container 3 which form a heat insulating container 1 is of the multilayer structure and at least, one of these layers is formed in an oxygen barrier resin, so that a vacuum state can be maintained in a hollow part for a long time. In addition, an inner wall 8 and an outer wall 9 forming the bottom container 2 is integrally formed with the inner wall 8 by a partition wall 10 formed on the outer wall 9. Therefore, the inner wall 8 and the outer wall 9 are not recessedly deformed by an atmospheric pressure, when the hollow part is set to a vacuum state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variety of heat insulating hollow bodies such as a heat insulating container, a lining of a refrigerator, and a heat insulating cover of an air conditioner for a ceiling, which are used for heat insulation, cold insulation, insulation insulation of inside and outside air. is there.

[0002]

2. Description of the Related Art A heat insulating panel made of a plate having a hollow double-walled structure, in which the air in the hollow part is evacuated to make the hollow part in a vacuum state to improve the heat insulating effect, is disclosed in JP-A-62-69083. It is already known as described in JP-A-7-195385.

[0003]

By the way, as described in the above-mentioned publication, it is possible to enhance the heat insulating effect by making the hollow portion of the plate-like body having the hollow double-wall structure into a vacuum state. However, when the air in the hollow part of the hollow double-wall structure is evacuated, it is unavoidable that the inner wall or outer wall of the plate-like body is concavely deformed to some extent by the external pressure, so that not only a good shape is not retained, If the concave deformation increases, the inner and outer walls approach or come into contact with each other, and the heat insulating effect decreases.

Therefore, an object of the present invention is a hollow double-wall structure having an inner wall and an outer wall, and even if the hollow portion is in a vacuum state, it is not concavely deformed by the external pressure,
An object is to provide a heat insulating hollow body which can maintain a good shape and can obtain a high heat insulating effect.

[0005]

The heat-insulating hollow body of the present invention for achieving the above object comprises a plate-like body having a hollow double-wall structure having an inner wall and an outer wall integrally formed by blow molding. A heat-insulating hollow body having a hollow double-walled plate-like body that constitutes the heat-insulating hollow body has an oxygen barrier property, and has a reinforcing means that integrates the inner wall and the outer wall,
It is characterized in that the air in the hollow portion is removed to bring the hollow portion into a vacuum state.

In the heat insulating hollow body of the present invention, the reinforcing means for integrating the inner wall and the outer wall of the plate-like body is a partition wall.

In the heat insulating hollow body of the present invention, at least one layer of the plate-like body having a hollow double wall structure is composed of a resin having an oxygen barrier property, and the resin having an oxygen barrier property is ethylene- It is characterized by being a saponified product of vinyl acetate copolymer.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 exemplifies a heat insulating container according to the present invention for accommodating 20 juice boxes of juice contained in a paper box all together.

The heat insulating container 1 is composed of a bottom container 2 and a lid container (not shown), and a continuous container 3 which connects them, and each of these containers is formed by blow molding a thermoplastic resin. The heat insulating container 1 is a closed container having a hollow double wall structure.

The bottom container 2 has a shape having a bottom wall 4 and a low peripheral wall 5 standing upright around the bottom wall 4, and a plurality of locking recesses 6 are provided on the end surface of the peripheral wall 5. The bottom container 2 is
The air in the hollow portion is sucked and removed from the exhaust hole to create a vacuum state.
Is doing. The inner wall 8 and the outer wall 9 forming the bottom container 2 are integrated with the inner wall 8 by a partition wall 10 formed on the outer wall 9, and the inner wall 8 and the outer wall 9 are formed even if the hollow portion is in a vacuum state.
Is designed not to be concavely deformed by the external pressure.

The partition wall is a wall that does not weld the inner wall or the outer wall to another wall by forming a recess such as a rib, but connects the two in the orthogonal direction while maintaining the shape of the flat inner wall and the outer wall. It is the body.

The lid container (not shown) has the same structure as the bottom container 2.

The continuous container 3 is a plate-shaped body 1 constituting each side wall.
1 are connected by thin-walled hinges 12, and the plate-shaped body 11 is formed by integrating an inner wall 13 and an outer wall 14 of the plate-shaped body 11 with a partition wall 15.
A plurality of locking projections 16 corresponding to the locking recesses 6 of the bottom container 2 and the locking recesses of the lid container are formed on the lower end surface and the upper end surface of 1, respectively. The air in the hollow portion of each plate-like body 11 forming the continuous container 3 is also sucked and removed from the exhaust hole to be in a vacuum state, but the exhaust hole is sealed after exhausting to form the seal portion 17. The continuous container 3 can be folded by the hinge 12 so as not to be bulky in the case of storage or delivery.

In FIG. 1, a virtual line A indicates a plurality of juice boxes to be stored.

The heat insulating container 1 according to the embodiment of the present invention is
Polyolefins such as polyethylene and polypropylene,
It is composed of polystyrene, polyethylene terephthalate resin, or engineering plastic having high rigidity, but the resin material is not particularly limited as long as it can be blow molded.

A bottom container 2 which constitutes the heat insulating container 1, a lid container,
The continuous container 3 has a multi-layer structure, and at least one of the layers needs to be made of an oxygen barrier resin, because this is to maintain the vacuum state of the hollow portion for a long period of time. Examples of the oxygen barrier resin include saponified ethylene-vinyl acetate copolymer, polyamide resin, polyvinylidene chloride and polyvinyl alcohol.

Such a multilayer structure is generally a multilayer structure in which an oxygen barrier resin is used as one layer at the time of extrusion of parison, but the invention is not limited thereto and, for example, the following surface coating method. A multi-layer structure according to is also possible.

In the surface coating method, the inner surface or the outer surface of the container is coated with an oxygen barrier resin, and the following method of coating the inner surface of the container is preferable. That is, an aqueous solution of polyvinyl alcohol, which is a water-soluble oxygen barrier resin, or a saponified product of an ethylene-vinyl acetate copolymer dissolved in a mixed solvent of water, isopropanol, and formic acid to about 10% is placed in a container after blow molding. Pour from the blow hole etc., shake the container well to spread the oxygen barrier resin liquid evenly in the container, and then dry at 60 ° C to remove water or mixed solvent, The oxygen barrier resin is evenly and evenly laminated to form a laminate.

2 to 5 exemplify a blow molding mode of the partition wall 10. 18 and 19 are a pair of split molds,
Reference numerals 20 and 21 are cavities, 22 is a sliding mold, 23 is a head, and 24 is a parison.

The parison 2 is provided between the pair of split molds 18 and 19.
4 is arranged, the sliding mold 22 is advanced, and the outer wall 9 (14)
Part of the inner wall 8 (13) is extruded and welded (FIG. 3), then the sliding die 22 is retracted (FIG. 4), and blow molding is further performed to inner wall 8 (13) and outer wall 9 (14). The partition wall 10 (15) in which and are integrated is formed (FIG. 5).

As is apparent from FIGS. 3 to 5, the walls of the bottom container 2, the lid container, and the continuous container 3 having a multi-layer structure have an olefin layer on the inner and outer surfaces and an oxygen barrier layer between them. There is.

FIG. 6 illustrates another embodiment. In this embodiment, a bottom wall 25 made of a plate having a hollow double-wall structure is connected to four sides of a peripheral wall 26 made of a plate having a hollow double-wall structure by a hinge 27.
A latch 28 and a latch receiver 29 are formed on the joint end surfaces of each peripheral wall 26. Bottom wall 25 and peripheral wall 26
The hollow portion is in a vacuum state, and the inner wall and the outer wall are integrated by the partition wall 30. The exhaust holes and their seals are not shown.

Also in this embodiment, the plate having a hollow double-wall structure has a multi-layer structure of oxygen barrier resin, and the multi-layer structure may be formed by the multi-layer Paris extrusion method or the surface coating method. .

FIG. 7 shows still another embodiment. This embodiment is a container-shaped heat insulating cover that covers the upper part of the air conditioner body 31 of the air conditioning equipment. That is, reference numeral 32 denotes a ceiling, and the air conditioner main body 31 located on the ceiling 32 is covered with a heat insulating container 33. The heat insulating container 33 has a hollow double wall structure in which the outer wall is welded to the inner wall and integrated by a large number of ribs 34 having the outer wall recessed,
The hollow part is in a vacuum state.

Also in this embodiment, the plate having a hollow double-wall structure has a multi-layer structure of oxygen barrier resin, and the multi-layer structure may be formed by the multi-layer Paris extrusion method or the surface coating method.

Since the outside air in contact with the air conditioner body 31 of the air conditioning equipment is cooled when the cool air is blown out, the water vapor in the air may form a dew point on the outer surface of the air conditioner body 31, causing water drops to drop from the ceiling. By covering the air conditioner main body 31 with the heat insulating cover 33 as shown in 7,
It is possible to prevent water droplets from dropping due to the dew point phenomenon.

Although the heat insulating container and the container-shaped heat insulating cover have been illustrated in the embodiments of the present invention, the present invention is not necessarily limited to such a heat insulating container and a container-shaped heat insulating cover. For example, the bottom wall of the container, the lid,
It may be a heat insulating hollow body that constitutes a part of the heat insulating container such as a peripheral wall, or, of course, can be widely implemented as a heat insulating hollow body that constitutes a heat insulating container or something other than a container.

In the present invention, as the reinforcing means for integrating the outer wall and the inner wall, ribs formed by recessing the outer wall as shown in FIG. 7 and ribs formed by recessing the inner wall can be used. Although it may be a partition wall as in the embodiment shown in FIG. 1, when the heat insulating container is required to have a design property, a partition wall having no recess is preferable.

In the present invention, the exhaust hole forming the seal portion may be used together with the blow hole at the time of blow molding, or may be formed separately. When forming separately, insert a self-closing means such as a rubber stopper, pierce the rubber stopper with a needle to remove the air in the container, and then weld the upper portion of the rubber stopper integrally with the outer wall. Then, the work of vacuuming the hollow portion can be efficiently performed.

[0030]

According to the present invention, a hollow double-wall structure having an inner wall and an outer wall, even if the hollow portion is in a vacuum state, is not deformed concavely by the external pressure and is good. It is possible to obtain a heat-insulating hollow body that retains a unique shape and has a high heat-insulating effect.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a heat insulating container according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a blow molding aspect of the heat insulating container shown in FIG.

FIG. 3 is an enlarged cross-sectional view of a part of FIG. 2, showing a state in which a sliding mold has been advanced.

FIG. 4 is an enlarged cross-sectional view of a part of FIG. 2, showing a state where the sliding mold is retracted.

FIG. 5 is an enlarged cross-sectional view of a part of FIG. 2, showing a state in which the sliding mold is retracted to form a partition wall.

FIG. 6 is an exploded perspective view of a heat insulating container according to another embodiment of the present invention.

FIG. 7 is a front view showing a partially cutaway heat insulating container according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation container 2 Bottom container 3 Continuous container 4 Bottom wall 5 Circumferential wall 6 Engagement recess 7 Seal part 8 Inner wall 9 Outer wall 10 Partition wall 11 Plate-like body 12 Hinge 13 Inner wall 14 Outer wall 15 Partition wall 16 Engagement protrusion 17 Seal part 18 , 19 A pair of split molds 20, 21 Cavity 22 Sliding mold 23 Head 24 Parison 25 Bottom wall 26 Peripheral wall 27 Hinge 28 Latch 29 Latch receiver 30 Partition wall 31 Air conditioner main body 32 Ceiling 33 Thermal insulation cover 34 Rib

Claims (3)

[Claims] 1. A heat insulating hollow body constituted by a plate-like body having a hollow double wall structure having an inner wall and an outer wall integrally formed by blow molding, the hollow double wall structure constituting the heat insulating hollow body. The plate-like body of (1) has an oxygen barrier property, has a reinforcing means for integrating the inner wall and the outer wall, and eliminates air in the hollow portion to make the hollow portion into a vacuum state. body. 2. The heat insulating hollow body according to claim 1, wherein the reinforcing means that integrates the inner wall and the outer wall of the plate-shaped body is a partition wall. 3. A plate having a hollow double-wall structure has at least one layer made of a resin having an oxygen barrier property, and the resin having the oxygen barrier property is a saponified ethylene-vinyl acetate copolymer. 2. The method according to claim 1, wherein
Or the heat insulating hollow body according to 2.